Update react-native-safe-area-context (expo#8459)

* Update react-native-safe-area-context

* Update NCL and docs

* Include all necessary files and add UIKit header import to get it to compile

* Update home and expo pkg to use SafeAreaView from react-native-safe-area-context

* Update dev home

app.json

@@ -7,7 +7,10 @@
     "sdkVersion": "37.0.0",
     "version": "37.0.0",
     "orientation": "portrait",
-    "platforms": ["ios", "android"],
+    "platforms": [
+      "ios",
+      "android"
+    ],
     "primaryColor": "#cccccc",
     "icon": "https://s3.amazonaws.com/exp-brand-assets/ExponentEmptyManifest_192.png",
     "updates": {

package.json

@@ -51,6 +51,7 @@
     "react-native-gesture-handler": "~1.6.0",
     "react-native-infinite-scroll-view": "^0.4.5",
     "react-native-maps": "0.26.1",
+    "react-native-safe-area-context": "^2.0.0",
     "react-navigation": "4.1.0-alpha.1",
     "react-navigation-material-bottom-tabs": "1.1.1",
     "react-navigation-stack": "^2.0.15",